Question 918999
If it takes 3 minutes to fill 4/5 of a tub how much longer will it take to fill the rest?
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4/5 in 3 mins --> 4/15 in 1 minute
Fill rate = 4/15 of a tub/min
min/tub = 1/(tub/min) = 1/(4/15) = 15/4 minutes
= 3.75 minutes
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or
3/0.8 = t/1
0.8t = 3
t = 3/0.8
t = 3.75 minutes